If m∠ABC = 80°, what is m∠DBC? Justify your reasoning.

60degrees

Step-by-step explanation:

if abd is 20and abc is 80 when we subtract we get 60 degrees

DBC = 60

Step-by-step explanation:

ABD + DBC = ABC  angle sum theorem

20 + DBC = 80

Subtract 20 from each side

20+ DBC -20 = 80-20

DBC = 60

answer set (b) 0.5, 3/4 80% is in order from least to greatest.  

step-by-step explanation:

in order to compare rational numbers to each other, it is much easier if they are in the same form.   typically, the best form in which to evaluate rational numbers is in decimals.   in order to convert a percent to a decimal, you would divide the given percentage by 100.   you can also accomplish the conversion by moving the decimal point over two places to the left.   for example, the decimal value of 80% is 80/100, or 0.8.   in order to convert a fraction to a decimal, you need to divide the numerator by the denominator.   for example, 3/4 is 0.75.   so, for choice (b) 0.5 3/4 (0.75), 80% (0.8) is the only choice in which the numbers are in order from least to greatest.  

y-y1=4(x-x1)

step-by-step explanation:

this is point-slope form since you only have 4 as the slope it goes in place of m

hope this : )